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Title: The photosynthetic acclimation of Lolium perenne growing in a free-air CO 2 enrichment (FACE) system

Abstract

Stands of Ryegrass (Lolium perenne L. cv. Bastion) were grown in the field at ambient or elevated (600μmol/mol) CO 2 concentration, high (560Kg/ha) or low (140Kg/ha) nitrogen addition and with a frequent (every 4 weeks) or infrequent (every 8 weeks) cutting regime. Plants were in the second year of a 3 year experiment. Exposure to elevated CO 2 was carried out with a Free-Air CO 2 Enrichment (FACE) system which provides the most "realistic" system of CO 2 fumigation currently available. Elevated CO 2 increased diurnal CO 2 assimilation by between 34 and 88% whilst reducing rates of stomatal conductance by between 1 and 42%. However, analysis of the A vs. Ci response showed considerable acclimation of the photosynthetic apparatus in response to elevated CO 2 - Vc max as an in vivo measure of RubisCO activity, decreased by between 29 and 35% in high CO 2, whilst J max, as a measure of the RubP regeneration capacity, showed no significant change. Two out of three additional perennial grassland species studied showed similar acclamatory behavior to Ryegrass. Diurnal assimilation rate, J max and, in most cases, Vc max, increased significantly directly after cutting of Ryegrass stands, but nitrogen treatment hadmore » little effect on any of these parameters. Neither stomatal density, stomatal index nor stomatal pore length of Ryegrass were significantly altered by growth in elevated CO 2. The results are discussed in terms of the limitation imposed on maximizing photosynthetic and growth responses of Ryegrass at elevated CO 2, by the ability of perennial species to increase long-term sink capacity under these conditions.« less

Authors:
 [1]
  1. Univ. of Essex, Colchester (United Kingdom)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
10109180
Report Number(s):
BNL-61079
ON: DE95004954; TRN: 95:001376
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: DN: Thesis submitted to Univ. of Essex, Colchester (United Kingdom) and Writtle Coll. (United Kingdom); TH: Thesis (M.S.); PBD: Nov 1994
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; 63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 54 ENVIRONMENTAL SCIENCES; PLANT GROWTH; COMPARATIVE EVALUATIONS; GRAMINEAE; PHOTOSYNTHESIS; BIOLOGICAL ADAPTATION; CARBON DIOXIDE; ECOLOGICAL CONCENTRATION; STOMATA; DENSITY; NITROGEN; CARBON SINKS; CARBON DIOXIDE FIXATION; GREENHOUSE GASES; lolium perenne; free-air CO2 enrichment; photosynthesis; acclimation; A/Ci response; stomatal density; 550500; 551000; 560400; 540120; METABOLISM; PHYSIOLOGICAL SYSTEMS; OTHER ENVIRONMENTAL POLLUTANT EFFECTS; CHEMICALS MONITORING AND TRANSPORT

Citation Formats

Bryant, Jonathan B. The photosynthetic acclimation of Lolium perenne growing in a free-air CO2 enrichment (FACE) system. United States: N. p., 1994. Web. doi:10.2172/10109180.
Bryant, Jonathan B. The photosynthetic acclimation of Lolium perenne growing in a free-air CO2 enrichment (FACE) system. United States. doi:10.2172/10109180.
Bryant, Jonathan B. Tue . "The photosynthetic acclimation of Lolium perenne growing in a free-air CO2 enrichment (FACE) system". United States. doi:10.2172/10109180. https://www.osti.gov/servlets/purl/10109180.
@article{osti_10109180,
title = {The photosynthetic acclimation of Lolium perenne growing in a free-air CO2 enrichment (FACE) system},
author = {Bryant, Jonathan B.},
abstractNote = {Stands of Ryegrass (Lolium perenne L. cv. Bastion) were grown in the field at ambient or elevated (600μmol/mol) CO2 concentration, high (560Kg/ha) or low (140Kg/ha) nitrogen addition and with a frequent (every 4 weeks) or infrequent (every 8 weeks) cutting regime. Plants were in the second year of a 3 year experiment. Exposure to elevated CO2 was carried out with a Free-Air CO2 Enrichment (FACE) system which provides the most "realistic" system of CO2 fumigation currently available. Elevated CO2 increased diurnal CO2 assimilation by between 34 and 88% whilst reducing rates of stomatal conductance by between 1 and 42%. However, analysis of the A vs. Ci response showed considerable acclimation of the photosynthetic apparatus in response to elevated CO2 - Vcmax as an in vivo measure of RubisCO activity, decreased by between 29 and 35% in high CO2, whilst Jmax, as a measure of the RubP regeneration capacity, showed no significant change. Two out of three additional perennial grassland species studied showed similar acclamatory behavior to Ryegrass. Diurnal assimilation rate, Jmax and, in most cases, Vcmax, increased significantly directly after cutting of Ryegrass stands, but nitrogen treatment had little effect on any of these parameters. Neither stomatal density, stomatal index nor stomatal pore length of Ryegrass were significantly altered by growth in elevated CO2. The results are discussed in terms of the limitation imposed on maximizing photosynthetic and growth responses of Ryegrass at elevated CO2, by the ability of perennial species to increase long-term sink capacity under these conditions.},
doi = {10.2172/10109180},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1994},
month = {11}
}

Thesis/Dissertation:
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